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Picking a Random Line from a File

module Enumerable   def random_line     selected = nil     each_with_index { |line, lineno| selected = line if rand < 1.0/lineno }     return selected.chomp if selected   end end # Create a file with 1000 lines open('random_line_test', 'w') do |f|   1000.times { |i| f.puts "Line #{i}" } end # Pick random lines from the file. f = open('random_line_test') f.random_line                                    # => "Line 520" f.random_line                                    # => nil f.rewind f.random_line                                    # => "Line 727"